新运费和请清关费默认应该是空，让用户自己填写，现在自动填充了一个不知道哪里来的值

src/views/ecw/order/special/discount.vue

@@ -214,6 +214,8 @@ export default {
     getOrderSpecial(){
       getOrderSpecial(this.form.orderItemId).then(r => {
         this.form = r.data
+        this.form.freight = ''
+        this.form.clearanceFreight = ''
       })
     },
     getOrderSpecialByApproveId(){